Rock drill



1-". M. SLATER Aug. 8, 1939.

BOOK DRILL Filed July 26, 1938 2 Sheets-Sheet l "JVENTOR Red/1!. 57a 2561" H IS ATTORNEY F. M. SLATER ROCK DRILL Aug. 8, 1939.

Filed July 26, 1938 2 Sheets-Sheet 2 MM P p H I 5 ATTORNEY siesta eam. I

sister iniilisssurg, assigner "it Co -rpa ny,Jersey City, "N. "J5, a

eifistrafiaii l iw-Jer'sy h mifieatib n dr at, as, sets life. 521,322 ib'oia'ims. (01.121-9) "'es relates to fluid actuated rock drills, use morefpalrticularly to rock drills of the regi ens known as stopers and used for ii i ill-ihgfliols in the roof of a drift.

@ne dbjject of the invention is to simplify the eenstraeuen of rock drilling mechanisms emii'ih g pneumatic feeding mechanism for ad-.

Wanting the drill toward the work.

Another object is to construct a compact and rugged rock drill and feeding mechanism peculiarly adapted fdi? use in spaces providing low head room Otherfdbj ts will be in part obvious and in partipqihted out hereinafter.

li'njth'efd'rawings accompanying this specifica= tibnang in which similar reference numerals refer to similar parts:

Figure l is an outside view in elevation, of a j drill constructed in accordance with the factice .of the invention Figure 2 is a side elevation, partly in section, of the rock drill shown Figure 1-,

Figure 3 is a transverse View taken through Figure 1 en the line '3=- 3-, and

i ures is a view similar to Figure 2 showing a modified for-in of the invention.

Referring more particularly to the drawings, and at-first t'o the form of the invention illustrated Figures 1 to 3 inclusive, designates a en-lung mechanism comprising a percussive 2| and a feeding element 22 attached to the percussive element for advancing it in fabicordance with the degree of penetration of the working implement 23 into the work.

Of the percussive element only the outer casing parts are shown. These comprise a cylinder 24, front and. back heads and 26, respectively, and a head block 21 interposed between the cylinder 24 and the back head 26. The casing parts may be suitably interlocked with each other in a well known manner to prevent relative lateral movement between them and at the front end of the front head 25 is a hood 28 from which projects the end of a chuck 29 that accommodates the Working implement 23. i

In accordance with the practice of the invention, the front head 25 and the back head 26 are provided, respectively, with lugs or flanges 30 and having threaded ste'rri's extending through the flange 3D to receive huts 31 whereby the cylinders may be firmly secured to the front head. On the' portions of the cylinders 33 lying within the bores 32 are enlargements 38, the peripheral surfaces 39 of which have a slide fit in the bores 32.

The enlargements 38, ,moreover, have shoul ders 40 that abut sleeves 4| carried by the back head 26 to provide adjustable seats for the shoulders. The sleeves 4| also extend slidably into the 10 bores 32 and each sleeve is provided with lugs 42 having apertures 43 registering with apertures 44 in the flanges 3i to receive bolts 45 whereby the sleeve M is drawn against the shoulder 40.

Thus, by means of the. above described arrangement the feeding cylinders 33 serve to clamp the casing parts of the percussive element firmly together and the sleeves are adjustable to. compensate for any slight variations in the distance between the front ends of the feeding cylinders20 ,4

that extend through the pistons-5| and nuts 53 threaded on the stems 52 clamp the rods pistons. l

The opposite or lower ends of the rods are likewise provided with reduced stems .54 that 1' extend through a crosshead 55 to which the rods to the are secured by nuts 56; and intermediate the rods 59 and on the lower surface of the crosshead 55 is a pointer 51 .to seat upon the rock for supporting the drilling mechanism. The pointer 51, in-effect, serves as a pivot for the drilling mechanism and the rock drill may be oscillated by the operator about an axis extending through the pointer 51 and the working implement 23 by a handle 58 secured to one of the feeding cylinders 33 by a bolt 59.

I p The handle 58 may thus serve as an instru- 3l which extend on opposite sides of the. heads.

Within the portions of the flange 3| lying on opposite sides of the backhead 26 are bores 32 to receive feeding cylinders 33 having their forward ends arranged in recesses 34 in the flange 30.

The ends of the cylinders 33 that seat .in the recesses 34 are provided with integral heads-35 or. to hold the drilling mechanism stationary in mentality for rotating the drill steel in the work the event that the percussive element is provided with mechanism for effecting automatic rotation of the working implement.

The pressure fluid supplied for both the feeding and percussive elements is conveyed to the drilling mechanism by a single conduit 60 connected to a valve casing 6i which is bored to receive a. throttle valve 62 having a lever 63 whereby said throttle valve may be rotated. The casing BI is shown located on the head block 21 and the throttle valve 62 is bored to provide a chamber 64 which is in constant communication with the conduit 60 through a passage 65 in the casing 6|.

The throttle valve 62 may be ported, in a well known manner, to admit pressure fluid to the percussive element wherein it may be distributed by suitable valve mechanism (not shown) to the cylinder 24. On the head block 21, the cylinder 24 and the front head 25 are ribs 66 having a passage 6'! which leads from the throttle valve 62' to branch passages 68 extending through the front head 25 and the heads 35 and opening into the front end of the feeding cylinders 33.

Any suitable control valve, designated in the present instance by 69, may be interposed in the passage 61 to cut off the flow of pressure fluid to the feeding cylinders and, if required, to communicate the feeding cylinders with the atmosphere tolower the pressure in the feeding cylinders. The control valve 69, shown for the purpose of illustration, is accordingly provided with a port 10 that communicates the several portions of the passage 61 with each other to admit pressure fluid into the feeding cylinders, and in the periphery of the valve 69 is a partly annular groove H to afford communication between the portion of the passage 61 lying forwardly of the valve 69 and an atmospheric port 12 in the rib 66 for bleeding pressure fluid from the feeding cylinders.

In the operation of the device, and assuming the valve 69 to occupy a position in which the port 10 is in registry with the several portions of the passage 61, the throttle valve 62 is moved to a position to supply pressure fluid to the feeding and percussive elements. The pressure fluid admitted into the feeding cylinders 33 will then move the percussive element towards the work and will continue to advance the percussive element in that direction to maintain it within favorable actuating position of the working implement 23.

Whenever the pressure in the feeding cylinders 33 is found to be excessive for immediate needs or if it be desired to discontinue feeding movement the valve 69 may be rotated to bring the groove 1| into registry with the forward portion of the passage 61 and the port 12 and a portion or all of the pressure fluid may be exhausted from the feeding cylinders 33 to retard the forward movement of the percussive element or to discontinue feeding movement altogether.

In practice, the present invention has been found to be highly desirable in drilling mechanism of the character described. By employing the feeding cylinders 33 as rods for securing the casing members of the percussive element tohitherto been accomplished only through the use of hand-supported and guided rock drills.

In the form of the invention illustrated in Figure 4 the feeding cylinders 13 of which only one is shown also serve to clamp the casing parts of the percussive element 2| together. In the present instance, however, the feeding cylinder is provided with external threads i l on its front end to engage the threads '75 of a recess 76 in the flange 3D. A gasket 1! is preferably interposed between the end of the cylinder 13 and the bottom of the recess 16 to seal the recess.

The opposite end of the feeding cylinder 13 is provided with internal threads 73 to accommodate a head 19 having a bushing 30 which serves as a wearing surface for the rod 50. The head 79 has a lateral flange Bl which abuts the end of a spacer 82 disposed about the cylinder 13 and seating against the flange 3| of the back head.

In assembling this form of the invention the casing parts of the percussive element are first placed in their correct relative positions. The feeding cylinders are then extended through the flanges 3i and threaded into the recesses 75. Thereafter, the spacers 82 are placed on the lower projecting ends of the feeding cylinders and the heads '19 are next threaded into the feeding cylinders to clamp the spacers 82 tight- 1y between the flanges 3| and 8| and to press the casing parts of the percussive element firmly together.

I claim:

1. A rock drill, comprising a percussive element having a plurality casing parts, a feeding device for the percussive element comprising a plurality of telescopically arranged members and one of said members serving to secure the casing parts together.

2. A rock drill, comprising a percussive ele- 4' ment having a plurality of casing parts, and a feeding device for the percussive element serving to secure the casing parts together.

3, A rock drill, comprising a percussive element having a cylinder and front and back heads,

and a feeding device for the percussive element acting against the front and back heads to clamp said heads to the cylinder.

4. A rock drill, comprising a percussive element having a cylinder and front and back heads, a feeding device for the percussive element comprising piston and cylinder members and said cylinder member being connected to the front and back heads for clamping said heads to the cylinder of the percussive element.

5. A rock drill, comprising a percussive element having a cylinder and front and back heads, a plurality of feeding cylinders for the percussive element attached to the front and back heads for securing said heads to the cylinder of the percussive element, a crosshead, pistons in the feeding cylinders having rods attached to the crosshead, and a pointer for the crosshead.

6. A rock drill, comprising a percussive element having a cylinder and front and back heads,

a pair of feeding cylinders threadedly connected to the front head and acting against the back head for securing said heads to the first said cylinder, pistons in the feeding cylinders having rods, a crosshead connecting the rods, and a pointer for the crosshead.

7. A rock drill, comprising a percussive element having a cylinder and front and back heads, a pair of feeding cylinders extending through the back head and secured to the front head, abutments on the feeding cylinders, acting against the back head for clamping the cylinder between the heads, a crosshead, pistons in the feeding cylinders attached to the crosshead, and a rock-engaging pointer for the crosshead.

8. A rock drill, comprising a percussive element having a cylinder and front and back heads, a pressure actuated feeding device for the percussive element connected to the front head, a passage in the cylinder and the front head for conveying pressure fluid to and from the feeding device, and a valve to control the passage.

9. A rock drill, comprising a percussive element having a cylinder and front and back heads, a pair of feeding cylinders threadedly connected to the front head, spacers on the feeding cylinders seating against the back head, heads threadedly connected to the feeding cylinders and acting against the back head to clamp the first said cylinder between the front and back heads, a crosshead, pistons in the feeding cylinders having rods connected to the cross-head, and a pointer for the crosshead.

10. A rock drill, comprising a percussive element having a cylinder and front and back heads, a pair of feeding cylinders connected to the front head, shoulders on the feeding cylinders, adjustable seats on the back head for the shoulders, a crosshead, pistons in the feeding cylinders having rods connected to the crosshead, and a pointer for the crosshead.

FRED M. SLATER. 

